<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var socket;
    //判断当前浏览器是否支持websocket
    if (window.WebSocket) {
        socket = new WebSocket("ws://localhost:7000/hello");
        socket.onmessage = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + ev.data;
        };
        socket.onopen = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = "连接开启了。。"
        };
        socket.onclose = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + "连接关闭了。。"
        };
    } else {
        alert("当前流浪器不支持websocket")
    }

    function send(message) {
        if (!window.socket) {
            return;
        }
        if (socket.readyState == WebSocket.OPEN) {
            socket.send(message);
        } else {
            alert("连接没有开启");
        }
    }
</script>
<form onsubmit="return false">
    <textarea name="message" style="height: 300px;width: 300px"></textarea>
    <input type="button" value="发送消息" onclick="send(this.form.message.value)">
    <textarea id="responseText" style="height: 300px;width: 300px"></textarea>
    <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''">
</form>

</body>
</html>